From mboxrd@z Thu Jan 1 00:00:00 1970 From: Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= Subject: Re: Tracers+cyclictest causing kernel oops Date: Tue, 28 May 2013 08:53:37 +0200 Message-ID: <20130528065336.GI11166@pengutronix.de> References: <20130503160546.GF8230@linutronix.de> <519B57A7.1010901@linutronix.de> <20130527080248.GE11166@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Sebastian Andrzej Siewior , linux-rt-users To: Tom Cook Return-path: Received: from metis.ext.pengutronix.de ([92.198.50.35]:58369 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932984Ab3E1Gxk (ORCPT ); Tue, 28 May 2013 02:53:40 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Mon, May 27, 2013 at 10:23:53PM +0100, Tom Cook wrote: > On Mon, May 27, 2013 at 9:02 AM, Uwe Kleine-K=F6nig > wrote: > [snip] > > What are you using fiqs for? AFAIK they are not well supported in > > mainline Linux even. >=20 > You're well on the way to plumbing the depths of my ignorance. This > is just me applying the RT patches to the raspberrypi linux tree. Th= e > nearest I can figure out an answer to your question is this, in > arch/arm/kernel/fiqasm.S, in __set_fiq_regs: >=20 > @@@@@@@@@@@@@@@ hack: enable the fiq here to keep usb driver happy > and r1, #~PSR_F_BIT > @@@@@@@@@@@@@@@ endhack: (need to find better place for this to happe= n) IIRC the usb driver is vital for the raspberry pi, but can you try to unbind the driver before enabling whatever breaks for you? Something like: cd /sys/bus/platform/drivers/dwc_otg in this directory are probably >=3D1 symlinks on devices. Do echo $devicename > unbind for each of them where devicename is the name of the symlinks. Best regards Uwe --=20 Pengutronix e.K. | Uwe Kleine-K=F6nig = | Industrial Linux Solutions | http://www.pengutronix.de/= | -- To unsubscribe from this list: send the line "unsubscribe linux-rt-user= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html